STL from libcxx looks for libc?

Clang Frontend
#1

I'm developing on a bare-metal cortex-m3 in C++ for fun and profit.

I recently decided to switch from GCC to clang.

I managed to set-up clang for cross-compiling for thumb2 (thanks to the
guys on llvm-dev mailing list).

Since I also needed to use the list container from STL, I installed libcxx.

I thought that as long as I give my own allocator, I shouldn't get anything
else more the what I use.

The compiler does find the library, but I get the following error

In file included from /home/emitrax/bin/llvm/lib/c++/v1/list:177:
In file included from /home/emitrax/bin/llvm/lib/c++/v1/algorithm:596:
/home/emitrax/bin/llvm/lib/c++/v1/cstdlib:96:9: error: no member named
'lldiv_t' in the global namespace
using ::lldiv_t;

etc...

I don't understand why it uses the cstdlib in the first place?

The symbol is declared in stdlib.h (that's what I get from man lldiv_t).
Is there some header inclusion missing?

Regards,
S.

#2

<cstdlib> includes <stdlib.h>.

I believe <algorithm> could change <cstdlib> to <cstddef> and be fine. It needs size_t. I suspect I originally included <cstdlib> to use rand, but random_shuffle has since changed to use the technology in <random>.

I'll put the switch from <cstdlib> to <cstddef> on my to-do list. Should be easy, I just need to retest.

Howard

#3

That seem to worked. Thanks.

I tried to run the tests under

llvm/projects/libcxx/test$ ./testit

but it couldn't find the libcxx when linking.

/usr/bin/ld: cannot find -lc++

that's another problem I need to fix. Currently I worked around
the header inclusion problem by using -I$(explicit_installation_path).

S.